225002221 has 4 divisors (see below), whose sum is σ = 228690844. Its totient is φ = 221313600.

The previous prime is 225002201. The next prime is 225002227. The reversal of 225002221 is 122200522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104244100 + 120758121 = 10210^2 + 10989^2 .

It is a cyclic number.

It is not a de Polignac number, because 225002221 - 2⁷ = 225002093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225002195 and 225002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225002227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844220 + ... + 1844341.

It is an arithmetic number, because the mean of its divisors is an integer number (57172711).

Almost surely, 2^225002221 is an apocalyptic number.

It is an amenable number.

225002221 is a deficient number, since it is larger than the sum of its proper divisors (3688623).

225002221 is an equidigital number, since it uses as much as digits as its factorization.

225002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688622.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 225002221 is about 15000.0740331506. The cubic root of 225002221 is about 608.2222008205. Note that the first 4 decimals are identical.

Adding to 225002221 its reverse (122200522), we get a palindrome (347202743).

The spelling of 225002221 in words is "two hundred twenty-five million, two thousand, two hundred twenty-one".